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Nexperia USA Inc. BZX585-B20,115
- Part No.:
- BZX585-B20,115
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-79, SOD-523
- Datasheet:
-
BZX585-B20,115.pdf
- Description:
- DIODE ZENER 20V 300MW SOD523
- Quantity:
- Payment:
- Shipping:
Inventory:7,523
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Product details
Overview
BZX585-B20,115 from Nexperia is a ±2 % tolerance Zener diode in SOD523 (SC-79) package, rated for 20 V nominal regulation voltage, 300 mW total power dissipation, and 40 W non-repetitive peak reverse power at 100 µs pulse width - used for precision voltage reference and overvoltage protection in compact DC-DC feedback loops.
For engineers reviewing the BZX585-B20,115 datasheet, BZX585-B20,115 pinout, BZX585-B20,115 application, or BZX585-B20,115 equivalent, this device serves as a low-profile, low-capacitance (≤14.0 pF) Zener regulator with 1.5 Ω typical differential resistance at IZ = 5 mA and temperature coefficient of +14.4 mV/K - critical for stable biasing in portable sensor interfaces and USB-powered peripherals.
Technical Context
This Zener diode operates in reverse breakdown to maintain a stable 20 V reference across load variations, with low dynamic impedance enabling tight regulation under transient current shifts. Its SC-79 package supports high-density PCB layouts while maintaining thermal resistance of 65 K/W from junction to solder point.
Designed for operation at IZ = 5 mA, it delivers 1.5 Ω typical differential resistance and exhibits a positive temperature coefficient (+14.4 mV/K), making it suitable for temperature-compensated reference designs where drift must be minimized across −65 °C to +150 °C junction range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 20 V at IZ = 5 mA - defines precise regulation point for feedback networks |
| Tolerance | ±2 % - ensures tight voltage accuracy without post-production trimming |
| Differential Resistance | 1.5 Ω typ. at IZ = 5 mA - minimizes output voltage variation under load current changes |
| Temperature Coefficient | +14.4 mV/K - enables predictable, linear drift compensation in wide-temperature applications |
| Total Power Dissipation | 300 mW at Tamb = 25 °C on FR4 with 35 mm² copper - sets continuous operating limit in standard PCB layouts |
| Non-repetitive Peak Power | 40 W at tp = 100 µs - supports surge suppression in ESD-coupled input stages |
| Diode Capacitance | 14.0 pF at f = 1 MHz, VR = 0 V - preserves signal integrity in high-frequency bias networks |
| Reverse Current | 0.05 µA max at VR = 15.2 V - ensures minimal leakage in battery-backed standby circuits |
Pinout & Package
SOD523 (SC-79) ultra-small flat-lead surface-mount package: 1.25 mm × 0.85 mm footprint, 0.65 mm height, cathode marked by bar on top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; marking bar identifies this terminal for correct orientation during placement |
| 2 | Anode (A) | Connected to ground or lower-potential rail; forms reverse-biased junction for Zener operation |
Key Features
| Feature | Design Value |
|---|---|
| Low-profile SMD package | SOD523 footprint (1.25 × 0.85 mm) enables routing under QFNs and in space-constrained IoT modules |
| Stable Zener voltage tolerance | ±2 % ensures consistent regulation without calibration in production-grade power management ICs |
| Low dynamic impedance | 1.5 Ω typical rdiff maintains <±10 mV output shift across 1–10 mA load current swings |
| Controlled temperature behavior | +14.4 mV/K coefficient allows predictable drift modeling in automotive cabin sensors operating from −40 °C to +105 °C |
| High surge robustness | 40 W non-repetitive peak power rating supports IEC 61000-4-2 Level 4 ESD protection in USB-C port clamping circuits |
Applications
| USB Power Delivery Feedback | Industrial Sensor Biasing |
|---|---|
|
Use Scenario: Regulating reference voltage for USB PD controller feedback divider in portable chargers. IC Role / Device Role / Timing Role: Zener diode provides stable 20 V reference to scale down 20 V bus voltage for ADC input or error amplifier sensing. Use Value: ±2 % tolerance and 1.5 Ω rdiff ensure ≤±20 mV reference error across temperature and load, meeting USB PD 3.1 ±3 % VBUS tolerance. |
Use Scenario: Generating precision bias voltage for MEMS pressure sensor front-end amplifiers in factory automation nodes. IC Role / Device Role / Timing Role: Acts as low-noise, low-drift voltage reference for op-amp biasing in 4–20 mA transmitter circuits. Use Value: +14.4 mV/K temperature coefficient enables first-order compensation when paired with NTC thermistors, reducing total drift to <0.1 %/°C. |
| IoT Node Voltage Clamp | Automotive Body Control Module |
|
Use Scenario: Clamping 3.3 V rail against transients in BLE-enabled smart lock PCBs with limited board area. IC Role / Device Role / Timing Role: Reverse-biased Zener shunts overvoltage spikes to ground before they reach RF SoC supply pins. Use Value: 14.0 pF capacitance avoids signal degradation on 2.4 GHz antenna traces; 40 W surge rating handles ISO 7637-2 Pulse 1/2a events. |
Use Scenario: Providing regulated 20 V supply for LIN transceiver bias in door module ECUs. IC Role / Device Role / Timing Role: Zener stabilizes local 20 V rail derived from vehicle battery via LDO, ensuring LIN PHY compliance under load dump. Use Value: 300 mW power rating sustains continuous operation at 10 mA load; −65 °C to +150 °C Tj range meets AEC-Q101 ambient requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX585-C20,115 | ±5 % tolerance vs. ±2 %; otherwise identical electrical specs and package | Acceptable where cost sensitivity outweighs voltage accuracy requirements | Select for cost-driven consumer electronics where ±5 % regulation suffices |
| MMSZ5248B-7-F | Same 20 V nominal, but SOD-123 package (2.7 × 1.4 mm); 500 mW Ptot; higher rdiff (23 Ω) | Requires larger PCB area but supports higher continuous power in industrial controls | Choose when thermal margin > size constraint, e.g., in 24 V PLC I/O modules |
Compared with BZX585-C20,115, the BZX585-B20,115 offers tighter voltage control essential for precision analog circuits; versus MMSZ5248B-7-F, it trades power handling for 55 % smaller footprint and 15× lower dynamic impedance - prioritizing miniaturization and regulation stability over thermal headroom.
Availability
BZX585-B20,115 is available at Aetrix Electronics and suitable for USB Power Delivery feedback, industrial sensor biasing, IoT node voltage clamp, and automotive body control module applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for BZX585-B20,115 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Nexperia is a global semiconductor expert focused on high-volume, high-reliability discrete and logic devices, serving automotive, industrial, and consumer markets with AEC-Q101 qualified components.
The BZX585 series belongs to Nexperia's general-purpose Zener diode product line, engineered specifically for compact, high-accuracy voltage regulation in space-constrained and thermally demanding applications.
FAQ
What is the maximum continuous forward current for BZX585-B20,115?
The absolute maximum forward current is 200 mA per limiting values table. However, forward conduction is not its intended operating mode; sustained forward bias above 100 mA risks thermal runaway due to low VF (~1.1 V) and limited thermal mass in SOD523 package.
Can BZX585-B20,115 be used in parallel for higher power handling?
No - Zener diodes exhibit manufacturing spread in VZ, causing current hogging if paralleled. Even matched units require ballast resistors, which defeat the purpose of using a low-rdiff device. For >300 mW, select a higher-rated package like SOD-123 or DO-35.
Does the 40 W non-repetitive peak power apply to AC waveforms?
No - the 40 W rating is defined only for square-wave pulses of tp = 100 µs at Tj = 25 °C prior to surge. For sinusoidal or repetitive transients, derating per Fig. 1 is mandatory; continuous AC operation violates absolute maximum ratings and causes irreversible junction damage.
How does the +14.4 mV/K temperature coefficient affect circuit design?
This positive coefficient means VZ increases ~14.4 mV per °C rise in junction temperature. In precision references, it must be compensated - e.g., by pairing with a negative-coefficient device or using it in temperature-stabilized ovens. Uncompensated use introduces ~288 mV drift over 20 °C ambient swing.
BZX585-B20,115 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- -
- Package/Case:
- SC-79, SOD-523
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 20 V
- Tolerance:
- ±2%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 55 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 700 mV
- Voltage - Forward (Vf) (Max) @ If:
- 1.1 V @ 100 mA
- Operating Temperature:
- -65°C ~ 150°C
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-523
BZX585-B20,115 FAQ
1.How can I place an order for BZX585-B20,115 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX585-B20,115 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for BZX585-B20,115 reliable?
The price and inventory of BZX585-B20,115 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX585-B20,115 is usually 5 days.
3.What payment methods are accepted for BZX585-B20,115?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX585-B20,115 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX585-B20,115?
BZX585-B20,115 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX585-B20,115 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for BZX585-B20,115?
For technical support, including BZX585-B20,115 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX585-B20,115 requirements.
6.How does Aetrix verify that BZX585-B20,115 is sourced from the original manufacturer or authorized distributors?
All BZX585-B20,115 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that BZX585-B20,115 meets industry standards.
7.What is the process for return or replacement of BZX585-B20,115?
All BZX585-B20,115 units undergo pre-shipment inspection (PSI). If there is an issue with BZX585-B20,115, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The BZX585-B20,115 part is unused and in its original packaging.
Return procedure for BZX585-B20,115:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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